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Business combinations and disposals - Schedule of the Valuation of the Intangible Assets Acquired (Details) - Ascend Management Innovations LLC - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 | Sep. 30, 2016
Components of intangible assets |  |
Fair value | $ 22,300 |
Customer relationships |  |
Components of intangible assets |  |
Useful life |  | 19 years
Fair value | 20,400 |
Technology-Based Intangible Assets |  |
Components of intangible assets |  |
Useful life |  | 8 years
Fair value | 1,700 |
Trade Names |  |
Components of intangible assets |  |
Useful life |  | 1 year
Fair value | $ 200 |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References No definition available. + Details
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